Owner`s manual

M SERIES DAC
INTRODUCTION TO THE M SERIES DAC
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THE V74, V75, and V87 I/O modules are installed in a BayTech M Series DAC and
are used in conjunction with a host module. The V74 has four EIA-232 serial ports,
the V75 has four selectable EIA-232/EIA-422 serial ports, and the V87 has four
selectable EIA-422/EIA-485 serial ports.
These modules allow a host computer system connected to the host module to
individually select up to four peripheral devices (e.g., bar code readers, security
systems, digital instruments, etc.) and send data to, or receive data from the selected
device. The V74/V75/V87 modules will simultaneously multiplex incoming data
from the peripheral devices to be transmitted to the host system. The method of data
transmission from the peripheral devices to the host system is dependent upon the
mode of operation. Each 4-port serial module features three user-selectable modes of
operation. The three modes of operation are:
Full Duplex Communication - Allows the host module to switch between
four peripheral devices and provides bidirectional data transfer between the host
module and the selected peripheral device. Data received from non-selected
peripheral devices is stored in a buffer until the port is selected by the host system.
Immediate Reporting Method - Provides automatic message multiplexing
from all peripheral devices. Data is buffered until a terminating character is received
or 256 characters are received. Messages are then sent to the host computer preceded
by a port identification code.
Command Reporting Method - Reports a single message, all messages, or
all buffered data from specific peripheral devices upon request from the host
computer. The V74/V75/V87 may be placed into "broadcast" mode where any data
received by a host module will be sent out all four ports of the selected module(s)
simultaneously.
In addition to the modes of operation, you may select the serial port configuration and
logical name for each port, the designated host module location, and the message
terminate character. These parameters are programmed by entering configuration
mode from the host module or service port. Changes are saved permanently in non-
volatile memory.
THE V77 ADM-1 programmable analog-to-digital input board, is a plug-in module
designed for use with the BayTech M Series DAC Data Acquisition Controllers. The
primary feature of the ADM-1 is a 12 bit, successive approximation, analog-to-digital
converter which provides conversion of data with high accuracy and resolution at
moderate throughput rates.
The ADM-1 can be operated as either eight differential or 16 single-ended inputs.
Signal input connections to the ADM-1 are made through a standard DB-25 female
connector. Data resolution is 12 bits using unipolar (0 to +X volts) operation or 11
bits plus sign in the bipolar (-X to +X volts) mode. A total of eight software
selectable and one hardware (jumper) selectable, unipolar/bipolar input voltage ranges